code: def test_get_size(self):
      self.conn_mock.size.return_value = 1942
  
      path = "/path/file"
      with fh.FTPHook() as ftp_hook:
          ftp_hook.get_size(path)
  
      self.conn_mock.size.assert_called_once_with(path)
  
imports: from __future__ import annotations
  from io import StringIO
  from unittest import mock
  import pytest
  from airflow.providers.ftp.hooks import ftp
label_desc: Use image node_id 12 for calling the TestFTPHook obj's underlying member method code with example usage: obj.test_get_size() without return types